Come to think of it more - and thinking doesn't always come easy for me too - I don't even know how I'd know whether someone is a Muslim or not. How can you tell a person's religion by looking at the person?
Crooked nose on an olive skinned person and say, "oh, that person is Jewish?" That seems rather a stretch.
I mean, I know my wife's religion because she wears a little gold cross around her neck, and says prayers that start with "Dear Heavenly Father" and end with "These things I promise and ask in Jesus name." So I can pretty much figure she's still a Christian - that and going to church with her at least once a week where she sings in the choir and teaches Sunday School.
But if I saw someone walking past my house, do any of you have any suggests as to how I know that person's religious? I mean, if the person was, say, a violent sadistic satanist or something, I'd like to know that.